Computronics Color Converter

-- Converts a _good_ rgb format into
-- 15-bit color for computronics lamps.
-- specifically takes values 0.0-1.0 for red, green, blue
-- this isn't specific to the minecraft mod it's written for
-- but it's what annoyed me into doing this
function rgb2x (r, g, b)
  local rx = math.floor(31*r)
  local gx = math.floor(31*g)
  local bx = math.floor(31*b)
  return bit32.lshift(rx,10) + bit32.lshift(gx,5) + bx
end